Mirror image rule applies to common law / CISG. Does not apply to the UCC. Not sure exactly what you are asking, but since painting a house is a common law situation, the mirror image rule would apply.

The rule only requires that acceptance mirrors the offer. Basically, a qualified acceptance or an acceptance with even minor terms that are different is not an acceptance per the common law mirror image rule. The UCC discards the mirror image rule and has its own criteria for acceptances (laxer rules).